[Asterisk-Users] Incoming callers aren't hearing ring

[Terry Wilson]

We just switched from three x100p's to a te410p for handling our 
incoming/outbound calls.  Everything works great, except incoming 
callers don't hear a ring while they are waiting for one of us to pick 
up.  The phones themselves ring fine, but the caller doesn't hear 
anything until someone picks up, or it transfers to voicemail.  Any 
clues as to what may be happening?

/etc/zaptel.conf
span=1,1,0,esf,b8zs
bchan=1-23
dchan=24
defaultzone=us

/etc/asterisk/zapata.conf
[channels]
usecallerid=yes
adsi=yes
callwaiting=yes
callwaitingcallerid=yes
threewaycalling=yes
transfer=yes
cancallforward=yes
echocancel=yes
echocancelwhenbridged=no
echotraining=yes
rxgain=1.5
txgain=1.5
immediate=no
switchtype=national
context=incoming
signalling=pri_cpe
group=1
channel => 1-23

/etc/asterisk/extensions.conf
[incoming]
include => sip-phones
exten => _5551212,1,Dial(SIP/6710,12,tr)
exten => _5551212,2,Dial(SIP/6710&SIP/6711&SIP/6712&SIP/6713,20,tr)
exten => _5551212,3,Voicemail2(u6710)
exten => _5551212,4,Hangup
exten => _5551212,103,Voicemail2(b6710)
exten => _5551212,104,Hangup